It's very early in his adventures and he's been gotten a little bit scorn from he dwarves who were not too impressed with him and only took him on because of Gandalf. He attempts to steal from the trolls at least in part to prove to them that he has some talents and deserves some respect.
In addition, Bilbo is also probably motivated by a latent, long dormant, thirst for adventure in and of itself, something Tolkien often attributes to his Tookish ancestry.
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He thought that the dwarves would be disappointed in him if he returned empty-handed to them, without any food or anything, and will not respect him as a burglar of the group.
He feels that if he's going to be a burglar, picking a troll's pocket is the best place to start.
He wanted to prove he was a good thief. Unfortunately he pulled out a talking purse and it yelled.
He tried to steal the money not food. If he stole food he would have been able to get away like a good bugler should.
Trolls are much bigger than dwarves and hobbits, at least in Tolkien's world of Middle Earth. They are almost the equivalent of giants. They could pick up the hobbit with one hand.
He wasn't sure, the pale glow mesmerized him until he picked it up.Because he can pick and choose which parts of the 1/14 of the treasure he can keep. Therefor, he chooses the arkenstone.
They decide what the people like depending to what Cd's and itune's they pick and they put that in there stores. And if an artist wants there CD in a certain store they usually offer to split the proceeds with the store.
when will they pick up garber